class B:
    def append(self):print('bbbb')
class C:
    def append(self):print('cccc')
b = B()
d = C()
b.obj = []
b.obj.append(1)
print(b.obj)
b.s=1
print(b.s)
print(b.__dict__)
# b = B()
# b.append()
# c = B()
# c.append()
# d = C()
# d.append()




class Queue:
    def __init__(self):
        self.lst = []
    def append(self,value):
        pass
    def pop(self):
        pass

q = Queue()
q.lst.append(10)
q.append(5)
print(q.lst)
q.pop()
print(q.lst)


